138526866 has 12 divisors (see below), whose sum is σ = 300141582. Its totient is φ = 46175616.

The previous prime is 138526859. The next prime is 138526933. The reversal of 138526866 is 668625831.

138526866 is a `hidden beast` number, since 1 + 385 + 268 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 107557641 + 30969225 = 10371^2 + 5565^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3847951 + ... + 3847986.

Almost surely, 2^138526866 is an apocalyptic number.

138526866 is an abundant number, since it is smaller than the sum of its proper divisors (161614716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138526866 is a wasteful number, since it uses less digits than its factorization.

138526866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7695945 (or 7695942 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 138526866 is about 11769.7436675571. The cubic root of 138526866 is about 517.4217370970.

The spelling of 138526866 in words is "one hundred thirty-eight million, five hundred twenty-six thousand, eight hundred sixty-six".